Chemical storage tank

ABSTRACT

A chemical storage tank includes at least a main body and two sealing members combined together with each other, integrally made of acid-proof and alkali-proof materials, with a storage space formed inside it for storing any chemical material or product, and with a circumferential wall having its upper and its lower end respectively formed with a connecting opening. The sealing members are integrally made of the same plastic material of the main body, respectively combined together with the upper and the lower connecting opening of the main body by Electronics high frequency welding or heater welding. Thus, the welding portions between the main body and the sealing members are located around the circumferential wall, able to prevent pressure in the tank from damaging the chemical storage tank to insure safety.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of application Ser. No.12/137,405 filed on Jun. 11, 2008, now pending, the content of witch ishereby incorporated by reference in its entirety.

FIELD OF THE INVENTION

This invention relates to a chemical storage tank, particularly to oneconsisting of a main body and two sealing members integrally made ofacid-proof and alkali-proof plastic materials respectively, leaving noweak portions possibly attacked by the pressure of the chemicals storedin it after having the main body welded together with the sealingmembers, ensuring the chemicals securely stored in it.

BACKGROUND OF THE INVENTION

US Patent Application Publication No. 2008/0067179A1, entitled “WATERTANK AND METHOD FOR MANUFACTURING A WATER TANK”, describes in the“DESCRIPTION OF THE PREFERED EMBODUMENT” section, paragraph [0048] that:A centering member 31 having the shape of a double cone is inserted intothe insertion socket 25 which are aligned with each other. The centeringmember 31 seats with axial clearance a land in the cavity as defined byboth recesses 24. The inner and outer fitting surfaces 16, 17 and alsothe rib ends 18, in some case, may abut on each other. The sealing means28 is inserted into the sealing channels 26. The sealing means may be aunitary sealing or, as shown, may be combined from two sealing strips 33which have mirror image cross-sections. The flange 22 of each openingedge structure R is formed with an outwardly protruding prolongingflange 32 at which the clamping skewbacks 23 are formed. The quickconnectors 29 are C-shaped clamps which are pushed over the clampingskewbacks 23 and which hold the sealing 33 compressed. The widths of theinner and outer fitting surfaces 16, 17 in relation to the thickness xof the tank part wall 30 and the outer sealing channel wall 34 alreadyhave been explained for to FIG. 7.

Apparently, in foresaid US Patent Application Publication No.2008/0067179A1, the sealing means 28 are necessary to be filled in thesealing channels 26 of the inner and the outer fitting surfaces 16, 17of the two members 1 located at the water tank so that the two members 1of the water tank can be combined and welded together. Different fromforesaid structure, the main body and the sealing members of thisinvention can be firmly combined together, needless to use the sealingmeans 28.

US Patent Application Publication No. 2006/0169704A1, entitled“DOUBLE-WALL CONTAINER FOR CRYOGENIC LIQUID”, describes in the “DETAILDESCRIPTION” section, that: “In FIG. 1 and FIG. 2, . . . . The innercontainer 1 comprises a central part 5 and end parts 6, 7. These parts5, 6, 7 are assembled from fiber-reinforced elements or are themselvessuch elements . . . ;” (Paragraph [0023]) “In the same manner, the outercontainer 2 comprises a central part 15 which is adjoined on both sidesby the end parts 16, 17. . . . ;” (Paragraph [0025]) and “The finishedinner container 1 with the collars 11, 12, which are used as thesupport, is fitted in the outer container 2, which is not yet completelyassembled, by said inner container being pushed into the central part 15of the outer container 2, which part is optionally already connected toone of the two end parts 16, 17, and then the two end parts 16, 17 ofthe outer container 2 or only the other end part is/are connected to thecentral part of the outer container. The centering slugs 8, 9 proveuseful again here. Only then is the outer container wrapped up with thefilament 20. The vessel is then essentially finished.” (Paragraph[0026]).

In foresaid US Patent Application Publication No. 2006/0169704A1, thewater tank is composed of the inner container 1 and the outer container2 secured together by the collars 11, 12 provided therebetween.Different in structure, the water tank of this invention is a singleone, and the main body and the sealing member can be firmly combinedtogether, unnecessary to employ the collars 11, 12.

Another U.S. Pat. No. 2,787,397, entitled “SELF-SEALING PRESSURIZEDPLASTICS CONTAINER”, includes a character 10 composed of a cap or anupper part and a body or a lower part. The side wall of the cap isconstructed to flare outwardly to form a blister as at 16 and then bentinwardly and back upon itself to form an annular recess 17 whichterminates in an upturned peripheral rim 18. The cap terminates in askirt portion 19 extending downwardly from annular rim 18. Only by theannular recess 17, 25 in the annular rim 18, 26 of the blister cap 1626,can the cap or upper part with longitudinal lands 12 at outer sides, andthe body or lower part of the character 10 be combined together.Different from foresaid structure, this invention has the main body andthe sealing members combined together by high frequency and heatwelding.

SUMMARY OF THE INVENTION

One object of this invention is to offer a chemical storage tank havingits main body and its sealing members integrally formed respectively.With two connecting openings of the main body respectively welded with acircumferential wall of the sealing members, welding lines are onlypositioned at the combining portion of the circumferential wall of themain body and those of the sealing members, able to sufficientlystrengthen the structure of the storage tank for securely storingchemicals.

Another object of this invention is to offer a chemical storage tankhaving its main body and its sealing members integrally made ofacid-proof and alkali-proof plastic material to prevent it from beingattacked by chemicals with a high acid value or a high alkaline value.

-   1. The chemical storage tank has its main body integrally made of    acid-proof and alkali-proof plastic material in any shapes, provided    with a storage space for storing chemical material or products.-   2. The circumferential wall of the main body has its upper end and    its lower end respectively formed with a connecting opening for    being welded together with the sealing members.-   3. The sealing members are integrally made of acid-proof and    alkali-proof plastic materials.-   4. Each of the sealing members is provided with a circumferential    wall employed to combine with the connecting openings of the    circumferential wall of the main body by Electrics high frequency    welding or heater welding.-   5. Each of the sealing members is provided with plural reinforcing    ribs to strengthen its structure.-   6. The sealing members have a thickness ranging between 10 mm and 45    mm.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an exploded perspective view of a preferred embodiment of achemical storage tank in the present invention;

FIG. 2 is a cross-sectional view of the preferred embodiment of achemical storage tank in the present invention; and

FIG. 3 is a perspective view of the preferred embodiment of a chemicalstorage tank in the present invention.

FIG. 4 is an exploded perspective view of a second preferred embodimentof a chemical storage tank in the present invention;

FIG. 5 is a cross-sectional view of the second preferred embodiment of achemical storage tank in the present invention; and

FIG. 6 is a perspective view of a third preferred embodiment of achemical storage tank in the present invention.

DESCRIPTION OF THE INVENTION

As shown in FIGS. 1 and 2, a preferred embodiment of a chemical storagetank in the present invention includes a main body 1 and plural sealingmembers 2.

The main body 1 is formed cylindrical, made of acid-proof andalkali-proof plastics. Of course, the main body 1 can be as well shapedannular, elliptic or square. But, an annular one is preferable as it canhomogeneously bear a higher pressure. The main body 1 is provided with astoring space 10 formed inside it for disposing chemical material orproducts, a circumferential wall 11, two connecting openings 12respectively formed in an upper end and a lower end of thecircumferential wall 11.

The sealing members 2 are integrally made of the same materials of themain body 1 so as to be compatibly welded together with it. The numberof the sealing members 2 is equal to that of the connecting openings 12formed in the upper end and the lower end of the circumferential wall 11of the main body 1. Each of the sealing members 2 is provided with acircumferential wall 21, said circumferential wall has a thicknessbetween 10˜45 mm, and a connecting opening 22 formed in one end of thecircumferential wall 21 for matching with one of the connecting openings12 of the main body 1 by electric high frequency welding or heaterwelding. And, as shown in FIGS. 2 and 3, the welding portions betweenthe main body 1 and the sealing members 2 are all located around thecircumferential wall of the storage tank, ensuring the whole storagetank to possess sufficient strength against pressure of a chemicalstored in it, keeping the storage tank secure in use.

In addition, as shown in FIGS. 1 and 2 again, each of the sealingmembers 2 is provided with a linking portion 24 formed with an arc forjointing the circumferential wall 21 and a top portion 23. In stead of asharp corner designed in the conventional one, the linking portion 24 isstrong enough to withstand the pressure of a storing chemical.

Moreover, as shown in FIGS. 2 and 3, each of the sealing members 2 isalso provided with a plurality of reinforcing ribs 25 positioned amongthe top portion 23 for strengthening the structure of the sealingmembers 2, so as to enable the storage tank to withstand more pressure,advancing security in service.

A second preferred embodiment of a chemical storage tank in the presentinvention, as shown in FIGS. 4 and 5, includes a main body 1 and sealingmembers 2, which are derived from those described in the first preferredembodiment. The jointing portion 24 of the top portion 23 and thecircumferential wall 21 of the sealing member 2 is formed with an arcfor preventing pressure in the chemical storage tank from directlyattacking the jointing portion 24 to enhance safety of the chemicalstorage tank. Unlike the first preferred embodiment, the top portion 23of the sealing member 2 of the second preferred embodiment is providedwith no reinforcing ribs 25. For facilitating combination with the mainbody 1, the top portion 23 of the sealing member 2 is formed with adownward-extending circumferential wall 26 that is covered around apartial circumferential wall of the main body 1, and then the main bodyand the sealing members 2 are combined together by high frequencywelding or heat welding.

A third preferred embodiment of a chemical storage tank in the presentinvention, as shown in FIG. 6, includes a main body 1 and a sealingmember 2. The main body 1 is the same as that described in the firstpreferred embodiment, but the sealing member 2 is composed of aplurality of units 2A respectively shaped in advance and then weldedtogether to form the sealing member 2. As shown in FIG. 5, the jointingportion 24 of both the top portion 23 and the circumferential wall 21 ofthe sealing member 2 are arc-shaped for preventing the jointing portion24 from being attacked directly by the pressure inside the chemicalstorage tank, thus able to elevate safety of the chemical storage tank.However, unlike the top portion in the first preferred embodiment, thetop portion 23 of the sealing member 2 in the third preferred embodimentis provided with no reinforcing ribs 25. Being closely combined with themain body 1, the top portion 23 of the sealing member 2 is formed with acircumferential wall 26 extending downward and covering a partialcircumferential wall of the main body 1, and then the main body 1 andthe sealing member 2 are firmly combined together by high frequencywelding or heat welding.

While the preferred embodiment of the invention has been describedabove, it will be recognized and understood that various modificationsmay be made therein and the appended claims are intended to cover allsuch modifications that may fall within the spirit and scope of theinvention.

1. A chemical storage tank comprising: at least a main body integrallymade of acid-proof and alkali-proof plastics and provided with a storagespace formed inside it, a connecting opening formed in two ends of acircumferential wall of said main body; and at least two sealing membersintegrally made of acid-proof and alkali-proof plastics, wherein each ofthe sealing members comprises; a circumferential wall having aconnecting opening formed in one of its two ends, said circumferentialwall has a thickness between 10˜45 mm, said connecting opening combinedtogether with said connecting opening of said main body by electricshigh frequency welding or heater welding.
 2. The chemical storage tankas claimed in claim 1, wherein said main body and said sealing membersare made of a same material.
 3. The chemical storage tank as claimed inclaim 1, wherein each of said sealing members is provided with a linkingportion formed with an arc for jointing its circumferential wall and itstop portion.
 4. The chemical storage tank as claimed in claim 1, whereineach of said sealing members is provided with plural reinforcing ribspositioned spaced apart equidistantly in said top portion.
 5. Thechemical storage tank as claimed in claim 1, wherein said sealing memberis made up by welding plural units together.